A bee hotel for mason/solitary bees used this website as a guide to build a bee hotel http://www.foxleas.com/bee_house.htm has hole diameters around 2mm-10mm increasing in 2mm increments total work in progress and currently printing so will report how it goes later first issue I have noticed is its a long print and uses quite a bit of plastic so I have infill set to 10% and have scaled in the z by 50% update 1: first print done needs a small rework of the stl file couple of the holes are a wee bit to close to each other also need to reduce size of border and roof edges which should reduce print time and material usage a good bit Update 2: Ive uploaded a redesign of the bee hotel holes are fewer but are aligned better and the outer has been totally changed to better protect the bees from the weather and to make it use less material to print I will be test printing shortly